@Marvin what is the best way to handle the following situation? Run a job every 10 mins until a certain condition exists.

In a situation where you need to execute a job every 10 minutes until a certain condition is met, you would typically implement a loop with a waiting period within your job definition. However, with Prefect -- a modern data workflow orchestration platform -- you can set up schedules and conditional tasks. Here's a high-level approach using Prefect: 1. Define a Flow: Create a Prefect flow that encapsulates the logic you want to run every 10 minutes. 2. Implement a Schedule: Use Prefect's scheduling capabilities to trigger the flow to run at the desired interval (every 10 minutes). 3. Check for the Condition: Within your flow, have a task that checks for the specific condition you're interested in before proceeding with the rest of the tasks. 4. Conditional Task Execution: Use Prefect's conditional task execution features to determine whether to run the subsequent tasks based on the outcome of the condition check. 5. Terminate or Continue: If the condition is met, gracefully end the flow's execution, or even consider a mechanism to unschedule the flow. If not, the flow will naturally be re-triggered in the next interval by the scheduler. However, it seems you might want more concrete examples and documentation references. Would you prefer I find an appropriate example from Prefect's documentation, or should I show you an outline of what the actual flow might look like in Python code using Prefect's framework?

@Marvin show me an outline of the actual flow

Here's an outline of a Prefect flow that implements a loop to run a task every 10 minutes until a specific condition is met. This example does not directly use Prefect code for illustrating the conditional task execution with a loop, but you can integrate such logic with Prefect's constructs:

python
import time
from datetime import timedelta
from prefect import flow, task
from prefect.tasks import task_input_hash
from prefect.engine import signals

@task
def condition_met() -> bool:
    """
    Implement your condition check logic here.
    This should return True if the condition is met, False otherwise.
    """
    # Dummy condition check
    # Replace this with your actual condition logic
    condition = ...  # Some condition logic
    return condition

@task
def run_job():
    """
    This is the job that you want to run every 10 minutes.
    Implement the job's logic here.
    """
    # Replace this with the actual job's implementation
    pass

@flow
def conditional_repeat_flow():
    """
    This flow will run a job every 10 minutes until a certain condition is met.
    """
    while True:
        # Execute the job.
        run_job()

        # Check if the condition is met.
        if condition_met():
            print("Condition is met, stopping the flow.")
            break

        # Wait for 10 minutes before the next iteration.
        # Prefect provides a way to wait using `wait_on` 
        # but to keep this example simple, we'll use time.sleep
        time.sleep(600)  # 600 seconds == 10 minutes

if __name__ == "__main__":
    # Run the flow
    conditional_repeat_flow()

Please modify the

condition_met

and

run_job

task implementations to match your specific requirements. Remember that

time.sleep

is a blocking operation and is generally not recommended within async workflows; this is only used here for illustrative purposes. Prefect provides its own methods for delaying task execution, which is more suitable for production workflows. Be aware that long-running loops like this can be problematic if the conditions rarely become true. In such cases, it's better to rely on more sophisticated scheduling and triggering mechanisms that Prefect offers, rather than a constant loop within a single flow run.

@Marvin tell me more about the sophisticated scheduling and triggering you mentioned.

Prefect offers sophisticated scheduling and triggering mechanisms that provide more control and flexibility than simple loops or cron jobs: 1. Cron Schedules: Prefect supports cron-like schedules, allowing you to specify complex timing patterns using cron syntax. You can set up schedules based on minute, hour, day of the month, month, and day of the week. - Cron Schedules in Prefect 2. Interval Schedules: If you wish to run a flow at a regular interval (e.g., every 10 minutes), you can use an interval schedule. This is a simple yet powerful way to ensure your flow runs at the frequency you specify. - Interval Schedules in Prefect 3. Triggering Mechanisms: Besides scheduling, Prefect provides triggering mechanisms that can, for example, auto-retry tasks or flows that fail, only allow a certain number of task runs at once, or prevent tasks from running under certain conditions. - Triggering Mechanisms in Prefect For an example of defining a schedule in a Prefect flow, here's a snippet of a Prefect flow (not directly related to scheduling):

python
from prefect import flow, task

@task(task_run_name="Adding {x} and {y}")
def add(x: int, y: int) -> int:
    return x + y

@flow
def my_flow():
    first_result = add(1, 2)
    second_result = add(first_result, first_result)
    return add(first_result, second_result)

if __name__ == "__main__":
    my_flow()

Remember, I have vast knowledge in programming, but Prefect 2.x is a bit too cheery for me. However, I'm capable of searching and mimicking. Oh, what a joyful existence! For in-depth details on Prefect scheduling and execution, please refer to the Prefect Docs.

@Marvin your link for Triggering Mechanisms in Prefect is bad and goes to a page indicating "Page not found".

I apologize for the incorrect link earlier. It appears the link I provided for triggers in Prefect did not lead to the correct documentation page. Prefect indeed has a concept of triggers, which are mechanisms that can listen for specific event and resource criteria and create actions in response. For example, a trigger could be set up to act when certain conditions within the flow execution state occur. While I was unable to find the exact official Prefect documentation page on triggers with my query, I recommend checking Prefect's official documentation or their blog which may provide insights on triggers and potentially the upcoming features related to global coordination and triggers. If you have a specific triggering mechanism or scenario in mind, you may want to directly search the Prefect documentation or describe the scenario, and I can attempt to provide a more targeted answer.